ice: ensure the copied buf is NUL terminated

Currently, we allocate a count-sized kernel buffer and copy count bytes
from userspace to that buffer. Later, we use sscanf on this buffer but we
don't ensure that the string is terminated inside the buffer, this can lead
to OOB read when using sscanf. Fix this issue by using memdup_user_nul
instead of memdup_user.

Fixes: 96a9a9341cda ("ice: configure FW logging")
Fixes: 73671c3162c8 ("ice: enable FW logging")
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Signed-off-by: Bui Quang Minh <minhquangbui99@gmail.com>
Link: https://lore.kernel.org/r/20240424-fix-oob-read-v2-1-f1f1b53a10f4@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/ethernet/intel/ice/ice_debugfs.c b/drivers/net/ethernet/intel/ice/ice_debugfs.c
index d252d98218d084e9782d899d4f854c0bf7101622..9fc0fd95a13d8f2c40475a94f38d3a2c088ab6f4 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_debugfs.c
+++ b/drivers/net/ethernet/intel/ice/ice_debugfs.c
@@ -171,7 +171,7 @@ ice_debugfs_module_write(struct file *filp, const char __user *buf,
        if (*ppos != 0 || count > 8)
                return -EINVAL;
 
-       cmd_buf = memdup_user(buf, count);
+       cmd_buf = memdup_user_nul(buf, count);
        if (IS_ERR(cmd_buf))
                return PTR_ERR(cmd_buf);
 
@@ -257,7 +257,7 @@ ice_debugfs_nr_messages_write(struct file *filp, const char __user *buf,
        if (*ppos != 0 || count > 4)
                return -EINVAL;
 
-       cmd_buf = memdup_user(buf, count);
+       cmd_buf = memdup_user_nul(buf, count);
        if (IS_ERR(cmd_buf))
                return PTR_ERR(cmd_buf);
 
@@ -332,7 +332,7 @@ ice_debugfs_enable_write(struct file *filp, const char __user *buf,
        if (*ppos != 0 || count > 2)
                return -EINVAL;
 
-       cmd_buf = memdup_user(buf, count);
+       cmd_buf = memdup_user_nul(buf, count);
        if (IS_ERR(cmd_buf))
                return PTR_ERR(cmd_buf);
 
@@ -428,7 +428,7 @@ ice_debugfs_log_size_write(struct file *filp, const char __user *buf,
        if (*ppos != 0 || count > 5)
                return -EINVAL;
 
-       cmd_buf = memdup_user(buf, count);
+       cmd_buf = memdup_user_nul(buf, count);
        if (IS_ERR(cmd_buf))
                return PTR_ERR(cmd_buf);